How to Avoid Freezing Sprinklers in Trash Chute?

9/26/2025

I'm trying to establish a way to avoid dry valves/dry systems to protect trash and line chutes early in project development. I've heard of freezing issues due to roof venting or other ways that cold air can fill the chute (perhaps from the bottom when trash room doors may be open to the exterior during severe cold).

I know most or maybe all of these fabricated chutes come with fire sprinklers, but are they usually essentially built-in dry barrel sprinklers?

If not, how can we ensure they won't freeze without using a dry system?

The specific chute submittal or product information is usually not available until well after space for a dry valve should be set aside.

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10 Comments

Glenn Berger

9/26/2025 08:13:40 am

You can use a horizontal dry sidewall sprinkler.

https://www.vikinggroupinc.com/products/fire-sprinklers/dry-barrel/sc/sidewall-dry/vk156-vk162-vk152

Lainey

9/26/2025 08:15:00 am

would an antifreeze loop be possible?
www.freezemaster.com

Thank Me Later

9/26/2025 08:34:17 am

https://www.victaulic.com/products/vicflex-dry-sprinkler-style-vs1/

Dan Wilder

9/26/2025 09:05:28 am

The issue is most trash chutes already come with a 1/2" FNPT connection and the 1/2" FNPT connection on the inside (a welded 1/2" union) and even a sprinkler on the interior at times. The discussion needs to start with the MFG to NOT place these welded connections and instead, install the base plate for the dry sprinkler connection. If that can't work, omit the sprinkler connection all together and field mount it.

Using a dry flex connection would be ideal, the mounting would be custom. A dry sprinkler could also work (again, mounting) then connected with a flex connection. Pending system size, antifreeze may also be suitable.

danefre

9/26/2025 12:17:09 pm

To answer your question, use a dry VicFlex Pendent, fed from the floor system.

That being said, what's the protection scheme for the Trash/Compactor Room where the chute discharges? That's usually why the dry valve is required.

Those rooms are very commonly adjacent to the exterior with double doors that can be left open for hours. And a gas heater that's struggling to keep up. If that's not the case then a dry valve wouldn't be necessary at all.

Jeff Ayers

9/26/2025 12:27:02 pm

All of the trash chutes on the projects I have worked on over the last 40 years have drywall sidewall heads. (they come installed that way and the sprinkler sub makes the connection)

As long as the bottom of the shaft (discharge into the compactor/ cans) is a heated, and the trash rooms at each level are conditioned, the heat from these areas is sufficient and has never caused a problem.

When the trash chute is in a parking garage or the compactor room at the bottom is not conditioned, we were forced to use a dry system.

Eric Ginder

9/26/2025 04:32:31 pm

Thank you for having the knowledge! I assumed this was the case after I thought about it but was not able to find any corroborating indication. I'm guessing the rumors I heard of freeze failure is exactly as you described - due to inadequate heat in the discharge room at the bottom.

Has anyone ever heard of gusts of cold wind coming in from the rooftop vent of the chute causing freeze? That's my only other concern.

I have also never been involved in actually designing or installing sprinklers in these pre-fabricated chutes - they're always integrated in my experience. Just never knew if they were dry.

Jesse

9/26/2025 12:50:08 pm

A dry HSW sprinkler could be a good option

Jack G

9/26/2025 03:52:10 pm

My opinion is that water in any area that is cold or erratic cold approaching freezing or below should never have water at the seat/ sprinkler head.
A trash chute is not many sprinklers considering the rest of the building.
So use dry pendants whether wet or dry system . Don’t create weak spots in your design/ installation.

James Art, FPE

10/1/2025 10:44:03 am

A trash chute fire may set off fire sprinklers inside on several floor levels. Ideally the chute (not shoot! ;-)
should be supplied by a separate indicating, supervised valve at the bottom in the trash room, and have it's own waterflow zone.
Is this code required?

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How to Avoid Freezing Sprinklers in Trash Chute?

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